Le Duc Vinh, Nguyen Tuan Minh, and Nguyen Van Trung. “Study to Use Gas Lift to Create Foam-Acid System to Handle Near-Bottom Zone in Bach Ho Field”. Petrovietnam Journal, Vol. 7, July 2019, pp. 37-43, http://www.pvj.vn/index.php/TCDK/article/view/169.